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CAD/CAM. Design Process and the role of CAD. Design Process. Engineering and manufacturing together form largest single economic activity of western civilization Distinguishing feature of wealthy economies . Design Process. Engineers and designers have turned to machines for assistance

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cad cam

CAD/CAM

Design Process and the role of CAD

design process
Design Process
  • Engineering and manufacturing together form largest single economic activity of western civilization
  • Distinguishing feature of wealthy economies
design process1
Design Process
  • Engineers and designers have turned to machines for assistance
  • Machines are computers and their task is information processing
design process2
Design Process
  • Clarification of task
  • Conceptual design
  • Embodiment of design
  • Detail design
design process3
Design Process
  • Reduction of time for product design and development has led to:
  • Simultaneous engineering or
  • Concurrent engineering
modeling and communication
Modeling and Communication
  • Models represent a physical artifact before it exists
  • Models vary in construction depending on what component is to be evaluated, manipulated or refined
  • Models can exist as different representations
modeling and communication1
Modeling and Communication
  • Major role of models is communication between participants of the design process
  • Design is sharing information and models are the means of communicating information
types of design models
Types of Design Models
  • Dependant on the property to be evaluated or communicated
  • Function
  • Structure
    • How parts are assembled
  • Materials
  • Surface condition
  • Dimensions
types of design models1
Types of Design Models
  • Engineering is primarily concerned with form and structure
  • Most appropriate method to represent these has been graphical
types of design models2
Types of Design Models
  • Form design is done with drawings that define shape, and arrangement of component parts of the design
  • Structure of the assembly is concerned with the way these are connected together and with flows (energy or material) between parts; SystemEngineering
types of design models3
Types of Design Models
  • Target receiver for the communication will determine the technique used to generate the model
  • It is crucial to avoid misinterpretation and ambiguity
  • Design models must conform to agreed standards
application of design models
Application of Design Models
  • Consider the receiver of communication
  • Two main classifications:
    • Evaluating
      • Actions taken to asses properties or merit
    • Generative
      • Actions that provide information from the model for downstream use (manufacture)
application of design models1
Application of Design Models
  • Visual assessment to ensure no obvious weak areas
  • Assessment of the mass of the components
  • Evaluation of loads in components
  • Evaluation of stresses using FEA
traditional design process
Traditional Design Process
  • “Over the wall approach”
  • Communication barriers are as high as the wall
  • Concurrent engineering breaks down barriers enabling more responsive product development and higher product quality
modeling using cad
Modeling using CAD
  • Design is progressively refined in the abstract until it is completely defined for manufacture or construction
modeling using cad1
Modeling using CAD
  • Models of the functional and other customer requirements for the design
    • These may change and develop as the design progresses
  • Models of the constraints on the design
    • Available materials or manufacturing capability
modeling using cad2
Modeling using CAD
  • Models of loads imposed on the design
  • Models used to evaluate the performance of design
    • Stress, thermal analysis, aerodynamic assessment
objective of cad
Objective of CAD
  • Apply computers to both modeling and communication of designs
  • Basic level use computers to automate or assist in tasks such as drawings, diagrams, parts list, BOM
  • Advanced level provide new techniques to assist designer in the process of design
cad system architecture
CAD system Architecture
  • Hardware
    • Computer and peripherals
  • Software
    • Programs running on hardware
  • Data
    • Data structure created and manipulated by the software
  • Human knowledge and activities
secret software data base
Secret Software Data Base
  • Model definition
    • To add geometric elements to a model of the form of a component
  • Model manipulation
    • Move, copy, delete, edit or modify elements in the design model
secret software data base1
Secret Software Data Base
  • Picture generation
    • To generate images of design model on a screen or hard copy device
  • User interaction
    • Handle commands input by user and present output to user
secret software data base2
Secret Software Data Base
  • Data base management
    • Process the files that make up the data base
  • Applications
    • Those elements of software that do not modify the model but generate information for evaluation analysis or manufacture
conclusion
Conclusion
  • Cad provides techniques for developing various ways to model a design
  • Cad can describe a design while it is still an abstract concept and communicating this description throughout the entire process
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